Textile treating apparatus



Dec. 22, 1964 E. J. BERGER ETAL 3,162,031

TEXTILE TREATING APPARATUS Filed April 23, 1963 8 Sheets-Sheet l J. BERGER ETAL -TEX'TILE TREATING APPARATUS Dec. 22, 1964 8 Sheets-Sheet 2 Filed April 2s, les

INVENTORS. l J er Dec. 22, 1964 E. J. BERGER ETAM.` 3,162,031

TEXTILE TREATING APPARATUS Filed April 23, 1963 8 Sheets-Sheet 3 IIG. 3

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Dec. 22, 1964 E. J. BERGER ET AL 3,162,031

TEXTILE TREATING APPARATUS Filed April 23, 1963 8 Sheets-Sheet 6 m i60 110 FIC-: 163 lZ 36 INVENTORS.

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United States Patent O Frce 3,162,031 TEXTILE TREATING APPARATUS Emil 5. Berger and Howard K. West, Lansdale, Fa., .assignors to Turbo Machine Company, Lansdale, Fa., a corporation of Pennsylvania Filed Apr. 23, 1963, Ser. No. 274,95S Claims. (Cl. 68-5) This invention relates generally to apparatus for treating textiles and particularly to apparatus for treating textile articles, such as hosiery, sweaters and the like, knitted from thermoplastic yarn, such as nylon, while stretched upon flat profile shaping forms.

A principal object of the invention is to provide an autoclave wherein textile articles may be treated with heated luid media with an auxiliary chamber wherein treated articles may be dried and with means for conveying the articles in batches successively from the autoclave to the auxiliary chamber for drying of each batch in the auxiliary chamber while the next following batch is being treated in the autoclave.

Another object is to provide such apparatus wherein the autoclave and auxiliary chamber are closely associated in a compact unit together with means for automatically conveying batches of the articles progressively from a load-unload station to the autoclave and then to the auxiliary chamber and back to the load-unload station.

Other objects of the invention will become apparent when the following description is read with reference to the accompanying drawings, in which:

FIGURE l is a front elevation of apparatus constructed in accordance with the invention;

FIGURES 2, 4 and 5 are side elevations of the apparatus;

FIGURE 3 is an enlarged horizontal section on line III- III in FIGURE l;

FIGURE 6 is an enlarged fragmentary plan view of the load-unload track section showing the carriage thereon in expanded condition;

FIGURE 7 is a vertical section on line VII-VII in FIGURE 6;

FIGURES 8, 9 and 10 are enlarged perspective views disclosing certain details;

FIGURE 1l is a horizontal section showing the door oi the autoclave open and a track section carried thereby in turn carrying a carriage which is latched against expansion;

FIGURES 12 and 13 are vertical sections respectively on lines XII-XII and XIII-XIII in FIGURE 11;

FIGURE 14 is a horizontal section showing the door of the autoclave closed and a track section carried thereby in turn carrying a carriage which is not latched against expansion;

FIGURES 15 and 17 are vertical sections respectively on lines XV-XV and XVII-XVII in FIGURE 14;

FIGURE 16 is a vertical section on line XVI-XVI in FIGURE 15;

FIGURE 18 is an enlarged vertical section on line XVIII-XVIII in FIGURE 3; and

FIGURES 19 through 23 'are diagrammatic figures illustrating the manner in which `the carriages are shifted from track section to track section.

Broadly, apparatus embodying the invention comprises l) an autoclave equipped with means for treating textile materials with iluid media, and (2) conveying means for loading the autoclave with work and removing the same therefrom.

Basically, the autoclave and its associated means for treating textile materials as aforesaid are the same as illustrated and described in the copending yapplication of Emil I. Berger and Howard K. West, Serial No. 57,098, tiled August 29, 1960, now Patent No. 3,131,840 of May 3,i62,3i Patented Dee. 22, 1964 5, 1964. However, it is not intended to be limited by the treating liquid supply and distribution facilities disclosed in said copending application since these facilities may take various other forms. Even the autoclave per se may take various other forms, but the type of door with which the autoclave is equipped is preferred, if not essential, the desideratum being an upright door that is mounted for movement from its fully closed position bodily outwardly from the autoclave and back again while being held always substantially parallel to the closed position thereof.

Referring particularly to FIGURES l, 2 and 3, the 'autoclave per se, generally designated itl, has a retractable door 12 at the front thereof hung from trolleys 14 which travel back and forth upon track bars 16 extending forwardly from the top of the autoclave. When closed, door 12 is held fluid-tight by retractable latches 18 against strip packing 20 disposed perimetrically about the opening of autoclave 10. Through rack and pinion means, designated 22, the door 12 is moved to opened and closed positions by a reversible electric motor 24 and an associated speed reduction unit 26 mounted atop the autoclave 1l). It is believed that a more detailed description of the autoclave 1li and the associated means for treating the textile materials is unnecessary for a fullunderstanding of the invention. However, reference may be had to the aforementioned copending application and the pat-ents referred to therein for a fuller description.

The inventive concept involves the provision of an auxiliary chamber in which the textile materials may be dried after they are removed from the autoclave or main treatment chamber lll and the provision of means for conveniently conveying the work from a load-unload station to the main treatment chamber 10 and through the auxiliary chamber back to the load-unload station for recirculation. Thus, it will be apparent that essentially the invention involves a novel auxiliary chamber and oonveyor in combination with an autoclave, for example, of the type disclosed in the aforementioned copending application.

Referring particularly to FIGURES l, 3, 6 and 7, t0 the left of the autoclave 1li, as viewed in FIGURE l, 4are a plurality of upright laterally spaced bents 2S which carry a stationary load-unload double track section, generally designated 39. The section 3l) includes 'a pair of horizontally extending base plates 32. Longitudinally spaced along each plate 32 are pairs of laterally spaced brackets 34. The `brackets on each side of the plate 32 are tied together by a horizontally extending vertically disposed plate 36. Mounted upon the brackets 34 on each side of the plate 32 is a horizontally disposed track bar 38.

Referring particularly to FIGURES 1, 2 and 3, to the right of the autoclave l@ are a pair of upright laterally spaced bents itl which carry a stationary transfer double track section, generally designated 42. The section 42 i11- cludes a pair of horizontally extending base plates 44. Longitudina-lly spaced along each base plate 44 are pairs of brackets 46. The brackets on each side of the plate 44 are tied together by horizontally extending vertically disposed tie plate 48. Mounted upon the brackets 46 on each side of plate dei is a horizontally disposed track bar 50.

Referring particularly to FIGURES 2 to 5 and ll, carried by the door 12 is a movable inner track section 51 including a pair of laterally spaced brackets 52, the ends of which carry rollers 54 supported on track bars 56. Intermediate the lbrackets 52 is a bracket S8. Overlying the brackets 52 and 5S are a set of spacer bars 60 which carry a set of four track bars 62.

Referring particularly to FIGURES 2 to 5 and 14, also carried by the door 12 is a movable outer track section 63 including a pair of laterally spaced brackets 64, the ends of which carry rollers 66 supported on track bars 68. Intermediate the brackets 64 is a bracket 7b. Overlying the brackets 64 and 7G are a set of spacer bars 72 which carry four track lbars 74. The forward ends of the track bars 68 are carried by adjustable studs 75 which in turn are carried by a framework 76. T he framework 76 also mounts a pair of adjustable studs 77 for a purpose to appear.

Referring particularly to FIGURES 1 through 5, extending upwardly from the forward extremities of the brackets '64 is a wall 73 and extending horizontally rearwardly to the door 12 from the top of the Wall 7S is a wall 80. T he opposite side openings defined by the walls 78 and Si) and the door 12 are closed by a pair of doors 82, the upper end portions of which are tied together by a pair of rods 83. The doors S2 are suspended from rollers 84 which travel on forwardly and upwardly inclined track bars S6. Each track bar S6 is supported at its rear end on the top of the autoclave, as at 88, and is supported` at its forward end on a cross member 92 of the framework 76, as at 90, the member 92 being carried by standards 94. Thus the walls 78 and Sti, the door 12 and the doors 82 dene an auxiliary chamber 95. The wall 78 mounts a compartment 15 in which are located a battery of lamps 98. Above the compartment 96 is mounted a blower 99 for forcing air through the compartment 96, over the lamps 98 and through openings 190 in the yWall 78 into the chamber 95. Extending rearwardly from the cross member 92 isa bracket 1112 which carries a pivot 11M for a latch 1116. The bracket also carries a solenoid 1158 for controlling the latch 1136.

Referring particularly to FIGURES 1, 3, 6, 7, 11 and 14, mounted upon the stationary load-unload track section 311, movable inner track section 51 and movable outer track section 63, respectively, are identical expansible carriages, generally designated 110, 112 and 11d. These carriages are of articulated cross-link construction. Each carriage is provided with guide rollersV 116 which travel between and are guided by the associated track bars. At opposite ends of the carriage, respectively, are crossbars 118 and 12). The carriage mounts a battery' of vertically extending conventional work supporting forms 121. Underlying the crossbar 12b is a disc 122,'the undersurface of which is provided with a depression 124. Underlying the c'rossbar118is a disc 126 from which a pin 12b extends through the crossbar 118. Fitted over the pin 123 is a collar 130 and a collar 132. The collar 132 is provided with axially extending, circumferentially spaced grooves 134. The undersurface of the disc 126 is provided with a recess 136, and extending radially outwardly from the disc 126 are a pair of circumferentially spaced lugs 13S and 141B. The crossbar 118 mounts a housing 142 which carries a spring pressed pin 1414, the end of which engages in one of the grooves 134. Pivoted to one of the articulated links of the carriage, Vas at 146, is a latch bar 148 which has `at one end thereof a hook 15th which is adapted to engage over a lug 152 mounted on another of v the articulated links. Proximate the hook 151i is a lateral projection 154V for coaction with ay latch lift 156 carried by a bracket ,153 affixed to the movable outer track section 63. Each of the crossbars 11S and 121i carries at opposite ends thereof a guide plate 1511, tapered, as at 162.

Referring particularly to FIGURES 1, 2, 6,77, 8, ll, 12,

14 and 17, a pin 164 extends upwardly into the recess 136 f 175 which overlie a runner 177 extending from the proximate tie plate 36 to prevent the chain frcrnnsagging.V Aiso mounted upon the shaft 174 is a chain sprocket 176 over which is trained a chain 178. The chain 178 is also trained over a chain sprocket 181) mounted upon a shaft 181 opposite end portions of which are journalled in the associated bent di). Also mounted upon the shaft 181 is a chain sprocket 182 over which is trained a chain 184. The chain 134i is also trained over a chain sprocket 1% mounted upon a shaft 192 having opposite end portions journalled in the associated bent liti and actuated through a speed reducer 194 by a reversible motor 196. Carried by the chain 18e is a housing 138 which mounts a spring pressed pin will that engages in the depression 124i formed in the undersurface of the disc 122. The arrangement is such that the chain 166 moves approximately three times as fast as the chain 18d.

Referring to FIGURES l to 3 and particularly to FIG- URE 19, the carriages 110, 112 and 114 are shown respectively mounted upon track sections 39, 51 and 63 with the full battery of forms carried by each carriage loaded with stockings. The main treatment chamber 11i is closed and the auxiliary chamber is closed. The carriage 111i is in expanded condition for convenient loading and unloading. Carriages 112 and 114 are shown collapsed, the carriage 112 being shown latched against expanding and the carriage 11d being shown collapsed but unlatched. T he stockings are treated with fluid media in the chamber 10 and, if desired, may even be partially or completely dried there. If the stockings are not completely dry when they leave chamber 1li, the drying operation Will be completed in the auxiliary chamber 95. For this purpose a lug 1% carried by the chain 184 operates a switch 2G11 to close the circuit to the lamps 98 and blower 99. Thus, treatment with fluid media in chamber 1@ and drying in chamber 95 go on simultaneously while the carriage 110 is being loaded or unloaded.

When treatment in chamber 11i and drying in charnber 95 are completed, the door 12 moves bodily forwardly from the chamber 11i from the position of PEG- URE 10 to that of FIGURES 4 and 20. Thus the chamber 11i is opened. At the same time, the door 12 carries the track sections 51 and 63 and the carriages 112 and 114 mounted thereon forwardly with it. The door 12 also carries the front wall 7% and the top wall 3G forwardiy and pushes the doors S2 along the track bars Se. Thus the auxiliary chamber 95 remains closed, and drying continuesrafter the door 12 opens.

As the door 12 approaches its foremost position, a switch 202 is operated thereby, whereupon motor 196 operates. Lug 1% moves clockwise (as viewed in FIG- URE l) about shaft 181, releasing switch 2%, whereupon the circuit to lamps 98 and blower 99 is opened. In the meantime, pin 1% moves clockwise about shaft 131, engaging in depression 124% and then moving to the right, pulling carriage 112 onto transfer track section 42. Carriage 112 remains latched against expansion. At the same time, pin 164 moves to the right bearing against one side wall of the recess to push carriage 111B. The carriage rst coliapses and is then pushed onto the inner track section 51. When the carriage collapses, ythe hook 15) engages over the lug 152 and latches the carriage against expansion. Near the end of the traverse of carriage 11d, the lug 133 strikes a lug 2113 afiixed to the track section 51 and turns the disc 12o so that its recess 136 faces to the right. Thus pin 162imay disengage from the disc as it moves clockwise about the shaft 174, At the same time, the detent 144 disengages from one groove 134 and engages in the other for accurate positioning of the disc 126. At the end of the traverse of carriage 112, the lug 19S (in its dotted line position shown in FiGURE 1) operates a switch (not shown) which opens the motor circuit, whereupon the carriages are arrested in the positions thereof shown in FIGURE 21.

Door 12 now moves bodily back to its closed position and carries trackv sections 51 and 63 and carriages 111i and 114 with it, the carriage 11d being guided by en aieaost gagement of the plates 169 with the studs '77. At the same time, door 12 carries front wall 7S and top wall 80 back to the initial positions thereof, but the doors .82 remain in their forward positions, being held by latch 106. This condition of the apparatus is shown in FIG- URES and 22.

As the door 12 approaches its fully closed position, Aa switch 264 is operated, whereupon the circuit to motor 196 is closed, whereupon pin ld moves back to the` left, pulling carriage 11d onto track section Sti and expanding the same for convenient loading and unloading. At the end of the traverse of carriage 114, lug ld@ engages a trip 2% and turns the disc 126 to its initial position. Pin 19h moves back to the left pushing carriage 112 onto track section 63, whereupon the projection 15d rides over latch lift 156 to raise the hook i5@ from the `lug 152 to .unlatch the carriage. ln the meantime, treatment of the stockings mounted on the battery of forms carried by the carriage l1@ commences in chamber 1d.

At the end yof the traverse of the carriage 1,12, the lug V19d re-engages and operates switch Ztltl and a switch 2%, whereupon the circuit to the lamps and the blower is closed and the circuit to the motor is opened. At the same time, the solenoid 198 is energized, whereupon the latch 106 is raised and the doors S2 released for return to their initial positions under the influence of gravity, as shown in FIGURE 19.

It will be understood that each carriage 1li?, H2 and 11,4 is advanced progressively from stationary load-unload track section 3l) lto movable inner track section S1 to stationary transfer track section d2 to movable outer track section 63 and back to stationary load-unload track section 30. Movement of a carriage fromrtrack section 30 to track section 51 to track section d2 occurs only when the door 12 is open. Movement from track' section 42 to track section e3 to track section 3i) occurs only when the door 12 is closed. Loading, unloading and reloading occur when a carriage is on the stationary track section 3G in expanded condition.

vIt will be understood, of course, that the present invention, as described and shown, is susceptible to various changes and modilications which may be made without any departure from the general principles or real spirit of the invention. For example, instead of heating lamps 98, other heating means may be substituted. In this connection, the heating means may be located elsewhere, for example, instead of being located high on the wall "78, the heating lamps 93 may be located low on the wall 78, and instead of being located over the compartment 96, the blower $9 may be mounted under the compartment Q6. Accordingly, it is intended to claim the present invention broadly, as well as specifically, as indicated in the appended claims.

What is claimed is:

l. In apparatus or treating textiles, the combination comprising means providing a main treatment chamber closed by a door in the front thereof movable bodily outwardly from the chamber, track means extending along the front of said door including longitudinally spaced stationary load-unload and transfer track sections respectively on opposite sides of the chamber, and track sections mounted respectively upon the inner and outer sides of said door for movement therewith, said outer movable track section being interposed `between and aligned with track sections, and means for opening and closing said chambers and actuating said carriages in predetermined timed relation whereby each carriage is progressively advanced from said stationary load-unload track section successively to the other track sections and then back to v work covering the movable outer track section and mounted upon said door for movement therewith, anda pair of doors closing openings respectively on oppos1te sides of said framework and operable for opening Ysaid aux1liary chamber for passage of said carriages into and out A of the same through said openings.

3. 1n apparatus for treating textiles, the combination as defined in claim 2 wherein `the pair of doors closing the openings respectively on opposite sides of the framework ot .the auxiliary chamber are mounted for substantially planar shifting movement outwardly from the main treatment chamber for opening the Vauxiliary chamber, said pairs of doors being operative in .the outwardly shifted position thereof for closing said auxiliary treatment chamber when the framework of the latter is moved outwardly by the door of said main treatment chamber.

4. In apparatus for treating textiles, the combination as dened in claim 2 wherein the doors of said auxiliary chamber are automatically shifted outwardly from the v main treatment chamber by the door of said main treatment chamber when the latter opens, and lthe means for opening and closing said chamber yand actuating the c arriages in predetermined timed relation includes means for automatically arresting positively the doors of said auxiliary chamber in their outwardly shifted position .for a predetermined time interval and then automatically releasing them for return to their initial positions.

5. ln apparatus for treating textiles, the combination as defined in claim 3 wherein the doors of said auxiliary chamber are automatically opened bythe door of lsaid main treatment chamber against .the iniiuence of gravity When the latter opens, and the means for opening and closing said chambers and actuating the carriages in predetermined timed relation `includes means for lautomaticially arresting positively .the doors of said auxiliary chamber in their outwardly shifted position for a predetermined time interval and then automatically releasing them .for return to their initial positions under the inuence of s gravity.

6. ln apparatus for treating textiles, the combination comprising means providing a main treatment chamber closed by an upright door in the front thereof movable bodily outwardly from the chamber to an upright position substantially parallel `to the initial closed position thereof, track means extending horizontally along the front of said door including lonigtrudinally spaced sta-- and aligned with said stationary track sections when said l door is open, means coacting with saiddoor Ato provide an auxiliary chamber over said Youter movable trackserction, carriages for supporting textile materials to lbe treated, said carriages being respectiyelymount'ed upon said stationary load-unload and movable inner yand outer track sections, means for openingand closing said chambers and actuating said carriages in predetermined ltimed .relation whereby each carriage is progressively advanced from said stationary load-unload ,track section successively to the other track sections and then back to said stationary load-unload track section, and means for treating ythe textile material in said main treatment chamber and then drying the same in said auxiliary chamber.

7. In apparatus for treating textiles, the combination comprising means providing a main treatment chamber closed by a door in the front thereof movable bodily` outwardly from the chamber, track means extending along the front of said door including longitudinally spaced stationary load-unload and transfer track sections respectively on opposite sides of the chamber, and track sections mounted respectively upon the inner and outer sides of said door for movement therewith, said outer movable track section being interposed between and aligned with said stationary track sections, and said inner movable track section being adapted for being interposed between and aligned with said stationary track sections when said door is open, means coacting with said door to provide an auxiliary chamber over said outer movable track section, carriages for supporting textile niaterialsto be treated, said carriages being respectivelyniounted upon said stationary load-unload and movableV inner andouter track sections, and means for opening and closing said chamf bers and actuating said carriages in predetermined timed relation including reciprocable means associated with said stationary track sections and coacting with the door of said main treatment chamber to shift said carriages from said stationary load-unload track section successively to said movable inner track section, said stationary transertrack section, said movable outer track section and then back to said stationary load-unload track section for treatment of the .textile materials first in said main treatment chamber and then in said auxiliary charnbe 8. ln apparatus for treating textiles, the combination comprising means providing a main treatment chamber closed by a door in theA front thereof movable bodily outwardly from the chamber,V track means extending along the front of said door including longitudinally spaced sta.- tionary load-unload and transfer track sections respectively on opposite sides of the chamber, and track `sections mounted respectively uponrthe inner and outer sides of said door for movementtherewith, said outer movable track section beinginterposed between and aligned with said stationary track sections, and said inner movable track section being adapted for being-interposed between and aligned with said stationary track sections when said door is open, means coacting with said door to provide an auxiliary chamber over said outer movable track section, expansible carriages for supporting textile materials to be treated, vsaid carriagesbeing respectively mounted upon said stationary load-un1oad and movableinner and outer track sections, means for opening and closing said chambers and actuating said carriages in predetermined tirned relation including means associated with said stationary track sections and coacting'with the door of said main treatment chamber to shift said carriages from said stationary loadunload track section successively to said movable inner track section, lsaid stationary transfer tracksection, said movable outer track section yand vthen back to said stationary load-unload track section fory treatment of the textile materials iirst in said main treatment chamber and then in said auxiliary chamber, and means for latching each of said carriages against expansion as it enters upon said movable inner ytrack section and for unlatching the carriage Yas it enters upon said movable outerV track section. c 9. In apparatus for treating textiles, the combination comprising means providing la mai-n treatment chamber l closed by a doorlin the front thereof movable bodily outwardly from the chamber,v track means extending alongV the front of said door including longitudinally spaced stationary load-unload and transfer track sections respectively on opposite sides of the chamber, and track sections mounted respectively upon the inner and outer sides of said door for movement therewith, said outer movable track section being interposed between and aligned with said stationary track sections, and said inner movable track section being adapted for being interposed between and aligned with said stationary track sections when said door is open, means coasting with said door to provide an auxiliary chamber over said outer movable track section, expansible carriages for supporting textile materials to be treated, one of said carriages being mounted upon said stationary load-unload track section in expanded condition and other carriages being mounted respectively upon said movable inner and outer track sections in collapsed condition, and means for opening and closing said chambers and actuating said carriages in predetermined timed relation including reciprocable means associated with` said stationary' track sections and coasting with the door ot said ymain treatment chamber to shift said carriages from said stationary load-unload track section successively to said movable inner track section, said stationary transier track section, said movable outer track section and then back to said stationary load-unload track section for treatment of the textile materials iirst in said main treatment chamber and then in said auxiliary charnber, said reciprocable means being operable for collapsing each of said carriages as it leaves said stationary loadunload track section and expanding each of said carriages as it reenters upon said stationary load-unload track scction.

l0. In apparatus for treating textiles, the combination comprising meansproviding a main treatment chamber closed by a door in the front thereof movable bodiiy outwardly from the chamber, track means extending along the front of said door including longitudinally spaced stationary load-unload and transfer track sections respectively on opposite sides of the chamber, and track sections mounted respectively upon the inner and outer sides of said door for movement therewith, said outer movable track section being interposed between and aligned with said stationary track sections, and said inner movl able track section being adapted for being interposed between and aligned with said stationary track sections when said door is open, means coacting with said door to provide an auxiliary chamber over said outer movable track section, expansible carriages for supponting textile materials to be treated, one of said carriages being mounted upon said stationary load-unload track sections in expanded condition and other carriages being mounted respectively upon said movable inner and outer track sections in collapsed condition, and means for opening and closing said chambers and actuating said carriages in predetermined timed relation including reciprocable means associated with said stationary track sections and coacting with the door Aof said main treatment chamber to shift said lcarriages from said stationary load-unload track section successively to said movable inner track section, said stationary transfer track station, said movable outer track section and then back to said stationary load-unload track ection for treatment of the textile materials iirst in said main treatment chamber and then in said auxiliary charnber, said reciprocable means associated with said stationary transfer track section being operable at a given rate of. speed While Vsaid reciprocable means associated with sald stationary load-unload track section being operable at a comparatively high rate of speed for collapsing each of said carriagesas it leaves said stationary load-unload track section and `expanding each of said carriages as it reentels upon said stationary load-unload track section.

References Cited in the le of this patent UNlTED STATES PATENTS 

1. IN APPARATUS OR TREATING TEXTILES, THE COMBINATION COMPRISING MEANS PROVIDING A MAIN TREATMENT CHAMBER CLOSED BY A DOOR IN THE FRONT THEREOF MOVABLE BODILY OUTWARDLY FROM THE CHAMBER, TRACK MEANS EXTENDING ALONG THE FRONT OF SAID DOOR INCLUDING LONGITUDINALLY SPACED STATIONARY LOAD-UNLOAD AND TRANSFER TRACK SECTIONS RESPECTIVELY ON OPPOSITE SIDES OF THE CHAMBER, AND TRACK SECTIONS MOUNTED RESPECTIVELY UPON THE INNER AND OUTER SIDES OF SAID DOOR FOR MOVEMENT THEREWITH, SAID OUTER MOVABLE TRACK SECTION BEING INTERPOSED BETWEEN AND ALIGNED WITH SAID STATIONARY TRACK SECTIONS, AND SAID INNER MOVABLE TRACK SECTION BEING ADAPTED FOR BEING INTERPOSED BETWEEN AND ALIGNED WITH SAID STATIONARY TRACK SECTIONS WHEN SAID DOOR IS OPEN, MEANS COACTING WITH SAID DOOR TO PROVIDE AN 